Query Question

hello all, I am looking for some help doing multiple queries.
I have two tables that are not related that I need to query on on PHP page.
The page is for people to register for an event.
The first table has a selection of dates for people to arrive and depart from an event (for registration purposes). The second table is a table containing the users information(name, address, etc) that they registered with.

On the page, I would like to have their information already populated, to verify, and then the form for registering, and drop boxes to display the registration dates.

Thanks.. I have tried that with no luck. I have posted the entire code below. Mind you, this is just trying to get everything working, so the HTML code after the PHP is simply for testing. Once I get it working, I'll finish the rest.